flex_content() {
  display: -webkit-box
  display: -moz-box
  display: -webkit-flex
  display: -moz-flex
  display: -ms-flexbox
  display: flex
}
flex_one() {
  -webkit-box-flex: 1
  -moz-box-flex: 1
  -webkit-flex: 1
  -ms-flex: 1
  flex: 1
}
flex_column(){
  webkit-box-orient: vertical
  -webkit-flex-direction: column
  -ms-flex-direction: column
  flex-direction: column
}
flex_align_center(){
  -webkit-box-align: center
  -webkit-align-items: center
  -ms-flex-align: center
  align-items: center
}
flex_align_start(){
  -webkit-align-items: flex-start
  align-items: flex-start
}
flex_justify_center(){
  -webkit-box-pack: center
  -webkit-justify-content: center
  -ms-flex-pack: center
  justify-content: center
}
flex_justify_space(){
  -webkit-box-pack: justify
  -webkit-justify-content: space-between
  -ms-flex-pack: justify
  justify-content: space-between
}
flex_justify_end(){
  -webkit-box-pack: end
  -webkit-justify-content: flex-end
  -ms-flex-pack: end
  justify-content: flex-end
}
